[Q] SPen not working properly

I've had my Note 3 almost since launch and had almost no issues with it, it has been in a spigen case and has fallen from less than 3ft a couple of times with no issues whatsoever, but now my spen is acting weird.

When writing but without the hand on the screen, everything is fine and work properly, but as soon as I put my hand resting on the screen, as I used to, it stops working fluidly and it shutters, even stopping from working at all, but I didn't had this issue in jb. Do you guys think is hardware related or can be solved some way. Had someone experienced something like this??

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